What is the € 113 rule in Spain?｜One of these rules states that they may be asked to prove they have enough money to last them the duration of their stay. – meaning a family of four visiting for a week must have at least €3,175.20.Each holidaymaker must be able to show they have €113.40 per day of their trip

Could you please explain the €113 rule in Spain to me? I've heard that travelers are required to prove they have sufficient funds for their entire stay. Does this mean that a family of four planning a one-week vacation would need to demonstrate possession of at least €3,175.20? Additionally, how does the daily amount of €113.40 per person work? Is this an average or a minimum requirement for each day of the trip? I'm curious to know more about this rule and how it applies to different travel scenarios.